fix: type in multistore (#7050)

* fix: type in multistore

* fix: get could also be undefined

* update changeset

* apply review feedback

Author: WojtekTheWebDev

Diff for: .changeset/twenty-drinks-tickle.md

@@ -0,0 +1,5 @@
+---
+"@vue-storefront/multistore": patch
+---
+
+[FIXED] Type issue in multistore package. Cache control `set` method returns `any` type and `get` returns `StoreConfig | undefined`. Also, `MiddlewareConfiguration` type has been removed as it is no longer necessary.

Diff for: packages/multistore/src/types.ts

@@ -10,12 +10,12 @@ export interface CacheManager {
   /**
    * Gets a store configuration from cache storage based on the `key` value.
    */
-  get(key: string): StoreConfig;
+  get(key: string): StoreConfig | undefined;
 
   /**
    * Sets a store configuration in the cache storage with identifier equals `key` value.
    */
-  set(key: string, value: StoreConfig): StoreConfig;
+  set(key: string, value: StoreConfig): unknown;
 }
 
 /**
@@ -43,18 +43,6 @@ export interface MultistoreExtensionMethods {
   }) => Record<string, StoreConfig>;
 }
 
-export interface MiddlewareConfiguration {
-  /**
-   * Multistore configuration.
-   */
-  multistore: MultistoreExtensionMethods;
-
-  /**
-   * Other configration entries, that are not being used by the multistore extension.
-   */
-  [key: string]: any;
-}
-
 /**
  * Parameters for updateConfig utility function.
  */